Learn how to setup the ClickPOS App so it is ready for operation. the guide includes how to build product catalogue (your Menu), Add registers, company logo to receipts and  work flow of a sale.
The initial setup requires planning to achieve best results. Try and categorise products into groups so it is easy to make sales,  The category is also used in the selection for printing all items under the category to specific printer, like print all meals orders to the kitchen printer, and coffees to the baristas printer.